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OpenTX Reference Guide 5 – Inputs

Each input can have multiple lines. Each line is enabled / disabled by the switch Switch parameter, the Mode parameter and the Side parameter. All of these parameters must be on for the line to be enabled. In this way, different parameters can control which settings are selected for the channel.

Each line has the following format.

 

Input Name

Weight

Source

Curve

Trim

Switch

Side

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Modes

 

Note that if a line is not enabled in all modes, the Modes display alternates every two seconds with Curve, Trim & Switch.

The inputs data flow diagram is shown here. The diagram shows multiple lines for one channel. Each of the 32 channels is designed this way.

 

 

To download this diagram, left click on it to display the pdf, then save it to a file.

 

A line is enabled if it’s Switch is on and the current flight mode is one of the selected modes.

Note that if the default setting of Switch and Mode are used, i.e. Switch is ‘---‘ and Modes are 012345678, then the line will be enabled. This will override all following lines. If you use a line like this, put this line as the last line so it will be used if no lines above it are enabled.

 

Each field is described in the table below.

 

FIELD

OPERATION

Input Name

Name given to the value calculated for this line. (max 4 chars)

Examples are IThr, IAil, etc.

Line Name

Name chosen to describe the function of this line. eg  Cruise, Sport, 3D.

(max 8 chars.)

Source

Rud, Ele, Thr, Ail,    (gimbal stick values.)

S1, S2, S3,    (pot 1, pot 2, spare analog input not connected!)

LS, RS,     (left slider & right slider)

MAX,     (constant, always +100%)

TrmR, TrmE, TrmT, TrmA,    (trim settings of rud, ele, thr & ail)

SA .. SH,    (switches A through H)

TR1..TR16, (training channels)

CH1 thr, CH2 ail, CH3 ele, CH4 rud, CH4..CH32,     (output channel values)

Batt,    (battery voltage)

Time,    (time of day in 24 hour format)

Tmr1, Tmr2,    (timer 1 & timer 2 values)

Telemetry Data

RSSI,    (Receiver Signal Strength Indication)

A1, Alt, Rpm, Fuel,    (receiver supply voltage, altitude, engine speed, fuel level)

T1, T2,    (temperature sensors 1 & 2)

Spd, Dist, GAlt,    (speed, distance & altitude above ground)

Cell, Cels,    (Voltage of the lowest cell, total battery voltage)

Vfas, Curr, Cnsp. Powr,     (peak voltage, current, maH, power)

AccX, AccY, AccZ,    (accelerometers X, Y & Z)

Hdg, VSpd, Aspd,    (heading, vertical speed, airspeed)

A1-, A2-, A3-, A4-, Alt-, Alt+, Rpm+, T1+, T2+, Spd+, Dst+, Aspd+, Cell-, Cels-, Vfas-, Curr+, Powr+.    (‘-‘ minimum value of parameter, ‘+’ is maximum value of parameter)

Weight

Range of the source signal, also called ‘rate’. (Range from –100% to +100%)

Minus values are discouraged because they effectively invert the signal.

Global variables GV1 to GV9 and –GV1 to –GV9 can be used as the weight value.

 

Linear - Default

Curve 01 Linear

The output value is always the same as the source value.

Weight = 70%

Curve 02 Weight

The output value is always 70% of the source value.

Offset

A value added to the source signal. (Range –100% to +100%)

Global variables GV1 to GV9 and –GV1 to –GV9 can be used as the offset value.

Press ENT LP to toggle between numbers and global variables.

 

Linear - Default

Curve 01 Linear

The output value is always the same as the source value.

Offset = 20%

Curve 03 Offset

The output value is 20% more than the source value

Curve

There are three types of predefined curve types. These are differential, exponential and function types. Alternatively, a custom curve can be used.

 

Diff (Predefined Differential Curve Type)

The positive weight of the source is set different to the negative weight.

This is used for ailerons to make the descending aileron move less than the ascending aileron. This can reduce yaw when banking.

  (Default = 0. Range -100 to +100)

 

Differential = 0%

Curve 01 Linear

The output value equals the source value always.

Differential = -50%

Curve 05 Diff Neg

When the source is negative the output is 50%. When the source is positive, the output is the same as the source.

Differential = +30%

Curve 04 Diff Pos

When the source is positive the output is 70%. When the source is negative, the output is the same as the source.

 

Expo (Predefined Exponential Curve Type)

Positive expo curves make the signal less sensitive around stick centre.

Negative expo curves make the signal more sensitive around stick centre.

Weight remains unchanged. (Default = 0, Range from –100 to +100)

Global variables GV1 to GV9 and –GV1 to –GV9 can be used as the expo value.

 

Exponential = 0%

Curve 01 Linear

The output value equals the source value always.

Exponential = +50%

Curve 06 Expo Pos

When the source is near the centre, the output has reduced movement. The weight remains the same.

Exponential = -50%

Curve 06 Expo Neg

When the source is near the centre, the output has increased movement. The weight remains the same.

 

Func (Predefined Function Curve Type)

  ---      output always = source

  x>0    If source > 0, then output = source. If source < 0, then output = 0.

  x<0    If source < 0, then output = source. If source > 0, then output = 0.

  |x|       Output = magnitude of input, but always positive. (also called ‘absolute value’)

  f>0    If source > 0, then output = 100%. If source < 0, then output = 0.

  f<0    If source < 0, then output = -100%. If soruce > 0, then output = 0.

  |f|      If source > 0, then output = 100%. If source < 0, then output = -100%.

 

X > 0

Curve 07  X GRT 0

When the source is positive, the output is the same. When the source is negative, the output is zero.

X < 0

Curve 08  X LTN 0

When the source is positive, the output is zero. When the source is negative, the output is the same.

| X |

Curve 09  X Mag

The output equals the magnitude of the source, but always positive.

f > 0

Curve 10  f GRT 0

When the source is positive, the output is +100%. When the source is negative, the output is zero.

f < 0

Curve 10  f LTN 0

When the source is positive, the output is zero. When the source is negative, the output is

 –100%.

| f |

Curve 11  f MAG

When the source is positive, the output is +100%. When the source is negative, the output is

-100%.

 

Cstm (Custom Curve Type)

Select a predefined curve numbered from !CV32 .. !CV1, ---, CV1 .. CV32.

!CVn is a mirror image of CVn around the vertical axis.

After selecting the curve number, ENT LP opens the. Curve screen. After configuring the curve, press EXIT to return here.

Modes

Modes can enable / disable this input line.

This field describes which flight modes enable this input line. The default settings are all modes 0 through 8 on.

To disable this input line in a flight mode, turn off the flight mode number.

ENT SP starts editing. +/- highlights a number. ENT SP toggles a number between flashing and off. EXIT SP finishes editing..

Switch

Switch positions can enable / disable this input line.

The switch positions are as follows ..

 ---,    (always enabled)

 Sn↑, Sn-, Sn↓ where n = A through H,    (enabled when the selected switch is in this

position.)

S31 .. S36 multi-position switch positions 1…6. (If fitted to analog input S3)

tRl, tRr, tEd, tEu, tTd, tTu, tAl, tAr,     (enabled when trim switches for rudder, elevator, throttle and aileron are in the left, right, up or down positions.)

!Sn↑, !Sn-, !Sn↓ where n = A through H,    (enabled when selected switch is not in this position.)

!tRl, !tRr, !tEd, !tEu, !tTd, !tTu, !tA1, !tAr,    (enabled when trim switches for rudder, elevator, throttle and aileron are not in the left, right, up or down positions.)

!S31 .. !S36 multi-position switch positions 1…6 If fitted to analog input S3. (enabled when switch is not in this position.)

Side

Gimbal stick ranges can be used to enable / disable this line.

---,    (enabled over full stick range)

x>0,    (enable this line only when the stick is > centre.)

x<0,    (enable this line only when the stick is < centre.)

Trim

The trim source is chosen here to add to the input source.

The trim sources are ..

Off,    (no trim source enabled)

On,    (trim source for this stick is used.)

Rud,  (rudder trim is added to this input source.)

Ele,   (elevator trim is added to this input source.)

Thr,   (throttle trim is added to this input source.)

Ail,    (aileron trim is added to this input source.)

 

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